import functools

# 公用的自定义工具类
from flask import session, current_app,g

from info.models import User


def do_index_class(index):
    '''返回指定索引对应的类名'''
    if index ==0:
        return 'first'
    elif index ==1:
        return 'second'
    elif index == 2:
        return 'third'

    return ''


def user_login_data(f):
    @functools.wraps(f)
    def wrapper(*args,**kwargs):
        user_id = session.get("user_id", None)
        user = None
        if user_id:
            # 尝试查询用户的模型
            try:
                user = User.query.get(user_id)
            except Exception as e:
                current_app.logger.error(e)
        g.user = user
        return f(*args,**kwargs)
    return wrapper